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Methacton High School English teacher Sean McCullough is arrested and charged with having a sexual relationship with a student. NBC10's Rosemary Connors reports. (Published Thursday, Aug. 16, 2012)

Police arrested a Montgomery County high school English teacher Thursday for allegedly carrying on a sexual relationship with a student that included exchanging nude photos as well as explicit messages on Facebook.

In one conversation, police say Sean McCullough wrote a message to the student that read-- "Don't be coy. Lose the shirt and panties."

Authorities charged McCullough, an English teacher at Methacton High School, with seven counts including depicting on a computer a sex act with a child, endangering the welfare of a child, corruption of minors and possession of child pornography.

McCullough, 43, of Collegeville, Pa. is accused of carrying on a sexual relationship with one of his female students while she was a senior during the 2009 and 2010 academic year.

Per a press release from Montgomery County District Attorney Risa Vetri Ferman.

McCullough was the female student’s teacher during her freshman through senior years in high school. The sexually inappropriate relationship began during her senior year, while McCullough was her Gifted Seminar teacher. McCullough engaged in an inappropriate relationship with the female student that included sexually explicit Facebook communications, emails, exchanging nude photos, and inappropriate sexual contact.

According to prosecutors, McCullough admitted in a written statement to carrying on the inappropriate sexual relationship with the girl while she was a minor.

Methacton Superintendent Dr. Timothy Quinn said in a statement Thursday afternoon that the district put McCullough on administrative leave while the fully cooperated with the county's and Lower Providence Police Department's investigations.

We appreciate our community’s understanding with regard to the need for confidentiality whenever matters of personnel are involved. Our primary focus will be the needs of our students and families; and we refer any questions about the investigation and allegations to the office of the district attorney.

McCullough arraigned at 4 p.m. Thursday and sent to county jail unable to post 10 percent of 50,000 bail, according to court records.